VtkUtil.hpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation.  Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 */
 
#ifndef VTK_UTIL_HPP
#define VTK_UTIL_HPP
 
#include "moab/EntityType.hpp"
 
namespace moab
{
 
//! Structure defining relation between MOAB and VTK element
//! types.  VTK had different types for quadratic than linear
//! elements, so a tuple of the MOAB type and number of
//! elements maps to a VTK type.
struct VtkElemType
{
    const char* name;            //!< String name for use in error messages
    unsigned vtk_type;           //!< VTK integer type
    EntityType mb_type;          //!< MOAB type
    unsigned num_nodes;          //!< Number of nodes (0 for polygon)
    const unsigned* node_order;  //!< VTK element node ordering, indexed by
                                 //!< the VTK node position and containing
                                 //!< the corresponding MOAB node position.
                                 //!< NOTE: This field is NULL if MOAB and VTK
                                 //!< ordering is the same!
};
 
//! General data about VTK files for use by read and write code.
//! \author Jason Kraftcheck
class VtkUtil
{
 
  public:
    //! vtk data type names, indexed by DataType
    static const char* vtkTypeNames[];
 
    //! Vtk types, indexed by VTK type number.
    //! For unused VTK type numbers, mb_type will be MBMAXTYPE.
    static const VtkElemType vtkElemTypes[];
 
    //! Lenght of \ref vtkElemTypes
    static const unsigned numVtkElemType;
 
    //! Get the VTK type corresponding to a tuple of the MOAB type and number of nodes.
    //! num_nodes is ignored for MBPOLYGON type.
    static const VtkElemType* get_vtk_type( EntityType type, unsigned num_nodes );
};
 
}  // namespace moab
 
#endif